[Verizon] Downsides to 4.3, reasons to stay at 4.2.2?

I'm still on 4.2.2 / MI1. Are there any downsides to updating to 4.3? I'm using my Verizon S4 on Straight Talk via AT&T and connect to HSPA / HSPA + just fine. Does 4.3 make that more difficult to do, is it possible to use the TMobile LTE 2100 MHz AWS band on the Verizon S4 with that update? Lastly I assume rooting and bootstrap are very much available?

Yea, but what if you have to have your phone replaced because it won't charge anymore? Is there anything to be done? I have a ton of apps that require root and would simply have to seek out a different model/brand if I couldn't root it.

I really liked the 4.3 update. My phone had no issues. The bootloader is locked but you can root with Safe Root. Now I'm having a few issues on Kitkat and waiting desperately for a root solution. Wish I had my old setup!